A Monoclinic Post-Stishovite Polymorph of Silica in the Shergotty Meteorite

DOI Web Site 被引用文献21件
  • Ahmed El Goresy
    Max-Planck-Institut für Chemie, J.-Becher-Weg 27, D-55128 Mainz, Germany.
  • Leonid Dubrovinsky
    Theoretical Geochemistry Program, Institute of Earth Sciences, Uppsala University, S-75236, Uppsala, Sweden.
  • Thomas G. Sharp
    Department of Geology, Arizona State University, Tempe, AZ 85287, USA.
  • Surendra K. Saxena
    Theoretical Geochemistry Program, Institute of Earth Sciences, Uppsala University, S-75236, Uppsala, Sweden.
  • Ming Chen
    Guangzhou Institute of Geochemistry, Academia Sinica, Guangzhou 510640, China.

書誌事項

公開日
2000-06-02
DOI
  • 10.1126/science.288.5471.1632
公開者
American Association for the Advancement of Science (AAAS)

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説明

<jats:p> A post-stishovite phase of silica was identified in the Shergotty meteorite by x-ray diffraction and field emission scanning electron microscopy. The diffraction pattern revealed a monoclinic lattice, similar to the baddeleyite-structured polymorph with the cell parameters <jats:italic>a</jats:italic> = 4.375(1) angstroms, <jats:italic>b</jats:italic> = 4.584(1) angstroms, <jats:italic>c</jats:italic> = 4.708(1) angstroms, β= 99.97(3), ρ = 4.30(2) grams per cubic centimeter, where the numbers in parentheses are the maximum deviations. Transmission electron microscopy investigations indicate the presence of the α-lead dioxide–like polymorph, stishovite, and secondary cristobalite in the same silica grain. The mixture of high-density polymorphs suggests that several post-stishovite phases were formed during the shock event on the Shergotty parent body. </jats:p>

収録刊行物

  • Science

    Science 288 (5471), 1632-1634, 2000-06-02

    American Association for the Advancement of Science (AAAS)

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